hadoop 异常 There are 0 datanode(s) running
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hdfs-site.xml里面的
dfs.datanode.data.dir
/tmp/hdfs_tmp
与 core-site.xml里面的
hadoop.tmp.dir
/tmp/hdfs_tmp
两个配置应该是指向同一个目录地址，而且必须是一个已经存在的linux目录(不存在目录的话，在启动hadoop时，必须手动创建，否则put文件到hdfs系统时就会报错)，今天报这个错就是因为两个配置没有指向同一个目录地址，且两个地址还不存在对应的目录
与
两个配置应该是指向同一个目录地址，而且必须是一个已经存在的linux目录(不存在目录的话，在启动hadoop时，必须手动创建，否则put文件到hdfs系统时就会报错)，今天报这个错就是因为两个配置没有指向同一个目录地址，且两个地址还不存在对应的目录
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